Traction mechanism



Jan. 11 1927. 3

M. P. HOLMES TRACTION MECHANISM Filed Oct. 8, 1921 39 4 "16 A g- 19 20 M 1!;

Patented Jan. 11, 1927.

UNITED STATES PATENT OFFICE.

MORRIS P. HOLMES, F CLAREMONT, NEW HAMPSHIRE, ASSIQNOR TO SULLIVAN MACHINERY COMPANY, A CORPORATION OF MASSACHUSETTS.

TRACTION MECHANISM.

Application filed October 8, 1921. Serial No. 506,494.

My invention relates to hoisting mechanisms, and more particularly to portable hoisting mechanisms;

An object of my invention is to provide an improved hoisting mechanism. Another object of my invention is to provide an improved portable, electrically driven hoisting mechanism. A further object of my invention is to provide an improved portable, electrically driven hoisting mechanism in which the driving motor is contained wholly within the hoisting drum. Other objects and advantages of my invention will appear in the course of the following specification and appended claims.

In the accompanying drawings I have shown for purposes of illustration one form which my invention may assume in practice.

In these drawings,-

Fig. 1 is a view partially in elevation, but mainly in central vertical longitudinal section through the illustrative form of my improved hoisting mechanism.

Fig. 2 is a view partially in elevation and partially in section with parts broken away, the section bein taken substantially on a plane corresponding to the line 22 of Fig. 1.

In this form of my improved hoisting mechanism which I have chosen for purposes of illustration, I have shown the same including a mounting consisting of a generally U-shaped base 1 having upstanding standards or brackets '2 and 3'disposed at the opposite ends thereof. Within the bracket 2 is rotatably journaled a large internal gear 4 having a sleeve 5 journaled within the bracket 2. The gear 4 is provided about its exterior periphery wit a braking surface 6 with which a brake band 7 provided with operating means 8 is adapted to cooperate, the brake band 7 being held against rotation by means indicated at 9. Journaled in the bracket 3 and within the sleeve 5 of th internal gear 4 are a pair of stub shafts 10 and 11 mounted in suitable bearings 12 and 13 and carried by the end plates 14 and 15 of a drum member 16.

\Vithin the drum member 16 and formed integrally therewith are arranged the field poles 17 of an electric motor generally designated 18. Suitable field coils 19 are carried upon the field poles 17 and an armature 20 having a commutator 21 is journaled by means of a shaft in suitable bearings 22 and 23, carried respectively in an intermed ate division wall 24 extending across the interior of the drum and in the head 14.

The armature shaft 25 is provided with a pinion 26 which meshes with gear 27 keyed 00 to a rotatable shaft 28 journaled between the head 15. and the partition wall24. A pinion 29 is mounted upon the shaft 28 and drives a gear 30 which is mounted upon a rotatable shaft, not shown, which extends through the head 15 and is journaled therein and carries a pinion 31 at the outside of the head 15. The pinion 31 meshes with a gear 32 journaled upon a stub shaft 33 and the gear 32 is adapted to cooperate as hereinafter described with the internal gear 4. Current may be supplied to the motor 18 by way of leads 34 and slip rings or other suitable means, not shown, arranged upon the shaft 10, the wires, as indicated at 35, ex-

tending through the shaft 10 and thereby permitting rotation of the drum relative to the bracket 3.

A cable is wound upon the periphery of the drum 16, say for example, in a counteradapted to cooperate with a brake band 40 which is in turn controlled by operating -means 41 similar to the means shown at 8.

,The mode of operation of the illustrative form of my improved hoisting mechanism as shown and described herein will be readily apparent. Assume that the direction of rotation of the armature 20 is clockwise when viewed from the right of Fig. 2, the pinion 26 will then rotate clockwise. "The gear 27 will be driven counterclockwise.

The pinion 30 will be driven clockwise.

The pinion 32 by reason of the clockwise rotation of the pinion 31 will be driven counterclockwise and when the. internal gear 4 is'held stationary. will roll around the inside of the gear 4 and cause the drum 16 to rotate in a clockwise direction about its axis. As a result, the cable 37 will be wound in. If it is desired to let out cable, this ma be done while the motor is still running by releasing the brake band 7 and the internal gear 4: will then be rotated ata rate equal to the rate of rotation of the drum 16 as cable is pulled 011', plus the rate at which it would be driven by the motor were the drum stationary. \Vhen it is desired to hold the drum 16 entirely stationary, this may be accomplished by application of the brake band 40. It will be obvious that any suitable control means may cooperate with the power leads 34.

While I have in this application specifically described one form which my invention may assume iii-practice, it will be understood that this form of the same is shown for purpose of illustration and that the invention may be modified and embodied in other forms of the same without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a hoisting mechanism, a rotatable drum, an electric driving motor disposed within said drum and comprising field and armature elements and so arranged with respect to said drum that one of said elements rotates at the same angular speed as the drum during winding operation, said field and armature being each coaxial with said drum, and means for transmitting power from the other element of said motor to said drum to cause rotation of the latter including an internal gear adapted to be h'eld stationary and operative connections between said gear and element including a plurality of gears one of which meshes with said internal gear and a plurality of which are rotatable on an axis fixed relative to the drum but ofiset from and parallel to the axis of the latter.

2. In a hoisting mechanism, a rotatable drum, an electric motor disposed therein and having a power shaft coaxial with said drum, an internal gear rotatable about an axis alined with the axis of said drum,

means for holding said gear stationary oi releasing it at will, and driving connections between said motor and gear including a pinion and a plurality of gears journaled on said drum for rotation about an axis onset from the axis of said drum, said pinion meshing with said internal gear.

3. In a hoisting mechanism, a rotatable drum, an electric motor disposed therein and having a power shaft coaxial with said drum, an internal gear rotatable about an axis alined with the axis of said drum, means for holding said gear stationary at will, driving connections between said motor and gear including a pinion and a plu- 13llty 0f gears journaled on said drum for rotation about an axis offset from and parallel to the axis of said drum, said pinion meshing with said gear,and means forbraking the rotation of said drum at will.

at. In'a hoisting mechanism, a rotatable drum, an electric driving motor disposed therein and having a power shaft coaxial with said drum, means forming a closed chamber within and rotatable with said drum, an internal gear alined with said drum and cooperating therewith to form a second closed chamber, driving gearing connecting said motor and said internal gear disposed wholly within said chambers, and

friction means cooperating with said internal gear to control rotation of said drum.

5. In a hoist, a rotatable drum and a motor disposed therein and at one'end thereof and comprising a shaft carrying an armature and being arranged coaxially with said drum, a. gear carried by said drum and adapted to rotate about an axis parallel to the axis of the drum but spaced therefrom, a driving connection between the free end of said shaft and said gear including a plurality of gears whose axes coincide with the drum axis, one of said latter gears comprising an internal gear with which said first mentioned gear is adapted to mesh during rotation of said drum, and means for locking or releasing said internal gear at will.

6. Ina hoist, a rotatabledrum and a motor disposed therein and comprising an armature and a field, the former being coaxial with said drum and the latter being rotatable at the same angular rate as the drum, 9. gear carried by said drum and adapted to rotate about an axis parallel to the axis of the drum but spaced therefrom, a drivin connection between said armature and sai gear including a plurality of coaxial gears carried by the drum but offset from the drum axis, a member carrying an internal gear with which said first mentioned gear is adapted to mesh during rotation of said drum and which cooperates with the end of said drum to form a chamber in which said first mentioned gear is enclosed, means for locking or releasing said member at will, and means for manually braking said drum.

7. A hoisting mechanism comprising s. rotatable drum, an electric motor having an armature shaft disposed coaxially with said drum and extending therein, a pinion thereon, a plurality of coaxial reduction gears carried b said drum on an axis parallel to said sha t and driven by said pinion and a second pinion driven by said coaxial gears, an internal gear coaxial with said drum and ing mechanism controlling said internal gear.

8. A hoisting mechanism comprising a rotatable drum, an electric motor disposed meshing with said second pinion, and brakwithin the same and at one end thereof and having a power shaft coaxial with said drum, a plurality of transverse members disposed within said drum at the other end thereof to form a chamber, one of said members carrying a stub shaft, an internal gear disposed at one end of said drum and adapted to rotatably support said stub shaft and to be held stationary at will, a plurality of coaxial gears disposed within said chamher and offset from and disposed parallel to the axis of the electric motor, said gear axes CERTIFICATE OF CORRECTION Patent No. 1,614. 031.

Granted January 11, 1927, to

MORRIS) HOLMES.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, line 81, claim 5, w after the syllable "ture" insert the words "said shaft having a free end within said drum"; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this29 th day of March, A. D. 1927.

sen.

M. J. Moore, Acting Commissioner of Patents. 

